Hey guys, I recently bought a 1993 C2500 with a 5.7 and a 4l80e with 145k from a neighbor who was the owned the truck since 1998. The truck is in overall decent shape but one consistent problem are the shifts that feel like the transmission is going to evacuate from the truck. The PO said that he had taken it to a few transmission shops and they mostly said that its normal operation even though it feels awful. As far as I know its the original trans and the PO said that its been shifting like this for at lest 10 years and hasn't failed yet. I Bought the truck very cheap and I have no use for it and I'm looking to sell it after I clean it up a little, but I'm concerned the shifting will put off any buyers. I just put a new AC Delco TPS on and test drove it and it shifts very late now and on top of it still being harsh. After the new TPS the engine light came on also and I have code 22, I also noticed when put I the new TPS on I had to turn it clockwise to get the holes to line up. When I first set it one the little dowel it sits at about the 11 o'clock position and I had to rotate it so I could install it. This is the same with the new and old sensor. I cant find any info on this hence why I'm writing this.I tested the TPS voltage and I got 0.46V closed and 4.2V at WOT for BOTH the old and new sensor. I have disconnected the battery cables and held them together of 30s and that had no effect. I know another cause for a hard shift is the fuel filter but that was replaced not long ago as the PO kept up with the truck quite nicely. Thanks